5HT 400-R Ceramic Fuse Equivalent & Substitute Parts

Part Overview

The 5HT 400-R is a 400 mA ceramic cartridge fuse rated for 250 V AC/DC operation in a 5mm x 20mm form factor, manufactured by Bel Fuse Inc. This slow-blow fuse is designed for applications requiring circuit protection with a 1.5 kA breaking capacity. The part maintains active product status with full compliance to international safety standards including CCC, CE, CSA, and cULus certifications. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and functional performance characteristics.

Key Parameters

Parameter	Specification
Current Rating	400 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Ceramic
Response Time	Slow Blow
Package / Case	5mm x 20mm
Breaking Capacity @ Rated Voltage	1.5 kA
Operating Temperature Range	-55°C ~ 125°C
Mounting Type	Requires Holder

Substitute Part Grouping Explanation

Substitution of the 5HT 400-R is determined by strict equivalence across the following critical parameters:

Current Rating: 400 mA (exact match required)
Voltage Rating: 250 V AC (exact match required)
Fuse Type: Cartridge, Ceramic (exact match required)
Response Time: Slow Blow (exact match required)
Physical Dimensions: 5mm x 20mm (exact match required)
Breaking Capacity: 1.5 kA (exact match required)
Operating Temperature: -55°C ~ 125°C (exact match required)

Parts meeting all these criteria are classified as parametric equivalents or similar alternatives. Variations in secondary parameters such as DC cold resistance or melting I²t do not preclude substitution when primary electrical and mechanical specifications align.

Parameter Comparison

Parameter	5HT 400-R (Bel Fuse)	5HTP 400-R (Bel Fuse)	0215.400HXP (Littelfuse)	0215.400MXP (Littelfuse)
Manufacturer	Bel Fuse Inc.	Bel Fuse Inc.	Littelfuse Inc.	Littelfuse Inc.
Current Rating (Amps)	400 mA	400 mA	400 mA	400 mA
Voltage Rating - AC	250 V	250 V	250 V	250 V
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Package / Case	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm
Breaking Capacity @ Rated Voltage	1.5 kA	1.5 kA	1.5 kA	1.5 kA
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Mounting Type	Requires Holder	Requires Holder	Requires Holder	Requires Holder
DC Cold Resistance	1.47 Ohms	1.47 Ohms	0.5825 Ohms	0.5825 Ohms
Melting I²t	0.28	0.28	1.325	1.325
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

All four parts listed maintain active product status and comply with international safety standards. The 5HTP 400-R from Bel Fuse Inc. is a parametric equivalent to the 5HT 400-R, differing only in series designation while maintaining identical electrical and mechanical specifications.

The Littelfuse 0215.400HXP and 0215.400MXP parts are functionally equivalent alternatives. Both are certified to CE, SEMKO, UL, and VDE standards. While the Bel Fuse parts carry CCC and CSA certifications in addition to CE and cULus, the Littelfuse alternatives provide equivalent circuit protection performance within the specified operating parameters. Selection between manufacturers should be based on supply chain requirements, certification scope for the target application, and inventory availability.

Frequently Asked Questions (FAQ)

Q: Can the 5HTP 400-R directly replace the 5HT 400-R?

A: Yes. Both parts are manufactured by Bel Fuse Inc. and share identical electrical ratings (400 mA, 250 V AC), fuse type (ceramic cartridge), response time (slow blow), physical dimensions (5mm x 20mm), and breaking capacity (1.5 kA). The series designation change does not affect functional compatibility.

Q: Are the Littelfuse 0215.400HXP and 0215.400MXP interchangeable with the Bel Fuse 5HT 400-R?

A: Yes, within the scope of matching electrical and mechanical specifications. All three parts share identical current ratings, voltage ratings, fuse type, response time, dimensions, and breaking capacity. Differences in DC cold resistance (0.5825 Ohms vs. 1.47 Ohms) and melting I²t (1.325 vs. 0.28) do not prevent substitution when primary protection parameters align. Certification differences (Littelfuse carries UL, SEMKO, VDE; Bel Fuse carries CCC, CSA) should be evaluated against application requirements.

Q: What is the difference between the 0215.400HXP and 0215.400MXP?

A: Both parts are manufactured by Littelfuse Inc. and are electrically and mechanically identical. They share the same current rating, voltage rating, fuse type, response time, dimensions, breaking capacity, DC cold resistance, and melting I²t specifications. Selection between these two part numbers should be based on supply availability and inventory status.

Q: Does the 5mm x 20mm physical dimension apply to all substitute parts?

A: Yes. All listed parts conform to the 5mm x 20mm cartridge fuse standard. Physical dimensions are 0.201" to 0.205" diameter by 0.787" length across all parts, ensuring mechanical compatibility with standard 5mm x 20mm fuse holders.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All four parts listed carry ROHS3 Compliant status and are REACH Unaffected, meeting environmental compliance requirements for electronic component applications.

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